Few layer graphene (FLG) samples contacted were irradiated with protons at an energy of 5 MeV and doses up to 2× 1015 /cm2. The electrical properties of ungated FLG sheets contacted by Pd/Au in a source (S)-drain (D) configuration, including VDS - IDS, VG - IDS, and the hole mobility, were compared before and after proton irradiation. After irradiation, it is observed that the ambipolar conduction of the FLG sheets was changed to a p-type conduction. The field-effect mobility of the hole carriers and the resistance in the graphene sheets greatly decreased because the proton irradiation increased the number of the surface states.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Science(all)
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering